"Apart from colour which is easy, we really need to know several things about silicon before we buy. 1) High or Low Modulus ( High is stronger, Low is more flexible ), 2) Acetic or Neutral Curing ( Acetic as in vinegar smelling is just as acidic and sets quick, Neutral does not corrode metals and sticks better but is slower to set ), 3) Solvent and filler content which can affect shrinkage and adhesion. Unfortunately the description does not give us any of this information to allow an informed choice."